US3703435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for finely disintegrating pulp,preferentially cellulose pulp,in connection with the bleaching thereof with gaseous bleaching agent
Assignee: Valmet AB
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Filing: 1971-05-14
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Granted: 1972-11-21
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Expires: 1991-05-14
Abstract
Abstract IN THE COURSE OF BEING DELIVERED INTO A GENERALLY VERTICAL BLEACHING VESSEL, CONTAINING A GASEOUS BLEACHING AGENT IN A FREE SPACE IN THE UPPER PART OF THE VESSEL, A CELLULOSE PULP IS SUBJECTED TO VIGOROUS MECHANICAL WORKING IN A DIRECTION TRANSVERSE TO THE FALLING DIRECTION THEREBY BEING FINELY DISINTEGRATED AND FLUFFED.
Inventors
- 👤 Rudi William Schleinkofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:43
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10; D21C9/1026
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |